Annual report pursuant to Section 13 and 15(d)

LONG???TERM DEBT - Schedule of Debt (Details)

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LONG‑TERM DEBT - Schedule of Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total debt $ 70,000 $ 72,942
Less current portion of long-term debt 0 15,764
Total long-term debt, net of deferred loan costs 70,000 57,178
Line of Credit | ABL Credit Facility    
Debt Instrument [Line Items]    
Total debt 70,000 55,000
Equipment financing | Equipment financing    
Debt Instrument [Line Items]    
Total debt $ 0 $ 17,942